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Table 5.
Lags between optical and X-ray pulsations.
| Date | Opt. Instrument | X-ray telescope | δϕ1 | δτ1 (μs) | δϕ2 | δτ2 (μs) |
|---|---|---|---|---|---|---|
| 2017 May | SiFAP2 | XMM-Newton | 1.32(18) × 10−1 | 2.23(31) × 102 | 1.154(45) × 10−1 | 1.950(70) × 102 |
| 2018 December, 11/12 | Aqueye+ | XMM-Newton | 9.0(3.8) × 10−2 | 1.52(64) × 102 | 4.7(1.4) × 10−2 | 7.9(2.4) × 10 |
| 2018 December, 15(*) | Aqueye+ | XMM-Newton | 5.9(4.1) × 10−2 | 9.9(7.0) × 10 | 0.7(1.6) × 10−2 | 1.2(2.7) × 10 |
| 2019 January | SiFAP2 | NICER | 1.0(1.0) × 10−1 | 1.8(1.7) × 102 | 3.0(2.1) × 10−2 | 5.1(3.6) × 10 |
| 2019 February | Aqueye+ | NICER | 9.7(4.1) × 10−2 | 1.63(69) × 102 | 1.50(18) × 10−1 | 2.54(31) × 102 |
| 2019 June(*) | SiFAP2 | NICER | 2.15(97) × 10−1 | 3.6(1.6) × 102 | 7.3(2.0) × 10−2 | 1.23(34) × 102 |
| 2020 January | SiFAP2 | NICER | 2.1(5.6) × 10−2 | 3.5(9.5) × 10 | 4.8(1.2) × 10−2 | 8.1(2.0) × 10 |
| 2020 January | Aqueye+ | NICER | −0.4(7.1) × 10−2 | −0.1(1.2) × 102 | 7.0(1.8) × 10−2 | 1.19(31) × 102 |
| 2022 Junuary | Aqueye+ | NICER | −0.3(1.1) × 10−1 | −0.5(1.9) × 102 | 6.4(2.1) × 10−2 | 1.08(36) × 102 |
Notes. (*)Cases in which it was not possible to analyze exactly simultaneous intervals between optical and X-ray observations.
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